C# Searching MongoDB string that starts with "xyz" - c#

I try to code a Storagesystem and i got one Problem and dont know how to solve it...
public static List<string> GetAllItemsFromDB(string Searchbar)
{
List<string> retList = new List<string>();
retList.Clear();
var filter = Builders<DB_Package_Item>.Filter.Eq(Item => Item.Item_Name, Searchbar);
var ItemsMatch = Item_DB.Find(filter).ToList();
foreach (var Item in ItemsMatch.ToList())
{
retList.Add(Item.Item_Name);
}
return retList;
}
This Works. But when i change the filter to:
var filter = Builders<DB_Package_Item>.Filter.ElemMatch(Item => Item.Item_Name, Searchbar);
It crasches as soon i type any char in the searchbar with Error code : "System.InvalidOperationException: "The serializer for field 'Item_Name' must implement IBsonArraySerializer and provide item serialization info."
"
I just dont get it why...
This is the Data_Package for MongoDB
public class DB_Package_Item
{
public Guid Id { get; set; }
public int Item_ID { get; set; }
public int Box_ID { get; set; }
public string Item_Name { get; set; }
public int Quantity { get; set; }
public string Partnumber { get; set; }
public string Supplier { get; set; }
}
Thx for every help!


FilterDefinitionBuilder<TDocument>.ElemMatch<TItem> or $elemMatch operator is for searching the item in the array field, which is not appropriate for your scenario to search (term) for a string field.
You need the $regex operator which is FilterDefinitionBuilder<TDocument>.Regex in C# syntax.
using System.Text.RegularExpressions;
var filter = Builders<DB_Package_Item>.Filter.Regex(Item => Item.Item_Name
, new Regex("^" + Searchbar));
For case-insensitive:
new Regex("^" + Searchbar, RegexOptions.IgnoreCase)
Or
var filter = Builders<DB_Package_Item>.Filter.Regex(Item => Item.Item_Name
, new BsonRegularExpression("^" + Searchbar));
For case-insensitive,
new BsonRegularExpression("^" + Searchbar, "i")

Related

C# parsing multiple json

The JSON data is as follows：
{"Sucess":true,
"Code":0,
"Msg":"Sucess",
"Data":{
"UserDayRanking":
{
"UserID":11452112,
"UserCharm":0,
"UserName":"gay",
"UserGender":1,
"UserLevel":36,
"UserPhoto":"http://res.xxx.com/2020/3/16/63719926625601201487545U11452112.jpeg",
"Ranking":0,
"IsNobility":0,
"NobilityType":0,
"NobilityLevel":0,
"UserShowStyle":null,
"LiveLevelUrl":null,
"IsStealth":false},
"DayRankingList":[
{
"UserID":3974854,
"UserCharm":114858,
"UserName":"jack",
"UserGender":1,
"UserLevel":91,
"UserPhoto":"http://res.xxx.com/2020/2/15/63717400601924412312384U3974854.jpeg",
"Ranking":2,
"IsNobility":1,
"NobilityType":1,
"NobilityLevel":3,
"UserShowStyle":
{
"NameColor":100102,
"BorderColor":100403,
"LiangMedal":0,
"DztCountDown":0,
"Mounts":100204,
"LiveLevelCode":0,
"LiveRights":null
},
"LiveLevelUrl":null,
"IsStealth":false
},
{"UserID":6231512,
"UserCharm":22644,
"UserName":"red.girl",
"UserGender":1,
"UserLevel":57,
"UserPhoto":"http://res.xxx.com/2019/11/20/63709843050801519858823U6231512.jpeg",
"Ranking":3,
"IsNobility":0,
"NobilityType":0,
"NobilityLevel":0,
"UserShowStyle":{
"NameColor":0,
"BorderColor":0,
"LiangMedal":0,
"DztCountDown":0,
"Mounts":0,
"LiveLevelCode":0,
"LiveRights":null
},
"LiveLevelUrl":null,
"IsStealth":false}
],
"LiveCharmSwitch":1,
"IsSelf":false
}
}
I want to use c # extraction
"UserID": 3974854,
"UserCharm": 114858,
"UserName": "jack",
"UserID":6231512,
"UserCharm":22644,
"UserName":"red.girl",
That is to extract UserID, UserCharm, UserName，This json has many layers,
What I want after the extraction is，id is sorted in order
id = 1, UserID = 3974854, UserCharm = 114858, UserName = jack
id = 2, UserID = 6231512, UserCharm = 22644, UserName = red.girl
I use the following code, but only extract the first one
string json = #"{"Sucess":true,"Code":0,"Msg":"Sucess","Data":{"UserDayRanking":{"UserID":11452112,"UserCharm":0,"UserName":"gay","UserGender":1,"UserLevel":36,"UserPhoto":"http://res.xxx.com/2020/3/16/63719926625601201487545U11452112.jpeg","Ranking":0,"IsNobility":0,"NobilityType":0,"NobilityLevel":0,"UserShowStyle":null,"LiveLevelUrl":null,"IsStealth":false},"DayRankingList":[{"UserID":3974854,"UserCharm":114858,"UserName":"jack","UserGender":1,"UserLevel":91,"UserPhoto":"http://res.xxx.com/2020/2/15/63717400601924412312384U3974854.jpeg","Ranking":2,"IsNobility":1,"NobilityType":1,"NobilityLevel":3,"UserShowStyle":{"NameColor":100102,"BorderColor":100403,"LiangMedal":0,"DztCountDown":0,"Mounts":100204,"LiveLevelCode":0,"LiveRights":null},"LiveLevelUrl":null,"IsStealth":false},{"UserID":6231512,"UserCharm":22644,"UserName":"red.girl","UserGender":1,"UserLevel":57,"UserPhoto":"http://res.xxx.com/2019/11/20/63709843050801519858823U6231512.jpeg","Ranking":3,"IsNobility":0,"NobilityType":0,"NobilityLevel":0,"UserShowStyle":{"NameColor":0,"BorderColor":0,"LiangMedal":0,"DztCountDown":0,"Mounts":0,"LiveLevelCode":0,"LiveRights":null},"LiveLevelUrl":null,"IsStealth":false}],"LiveCharmSwitch":1,"IsSelf":false}}";
List<Info> jobInfoList = JsonConvert.DeserializeObject<List<Info>>(z);
foreach (Info jobInfo in jobInfoList)
{
//Console.WriteLine("UserName:" + jobInfo.UserName);
}
public class Info
{
public string UserCharm { get; set; }
public string UserName { get; set; }
public data DayRankingList { get; set; }
}
public class data
{
public int UserID { get; set; }
public string UserCharm { get; set; }
public string UserName { get; set; }
public string UserGender { get; set; }
public string UserLevel { get; set; }
}
The above code only shows username = jack，Never show username = red.girl

As it looks to me then you want some details from your JSON has the which is in DayRankingList. As you only want some data then we can use a tool like http://json2csharp.com/ to create our classes and then remove what we don't need. Then we end up with the following classes.
public class DayRankingList
{
public int UserID { get; set; }
public int UserCharm { get; set; }
public string UserName { get; set; }
}
public class Data
{
public List<DayRankingList> DayRankingList { get; set; }
}
public class RootObject
{
public Data Data { get; set; }
}
Which you can deserialise like this
string json = .....
var root = JsonConvert.DeserializeObject<RootObject>(json);
Then if you wish, you can extract the inner data into a new List<> and then just work on that.
List<DayRankingList> rankingLists = root.Data.DayRankingList;
//Do something with this, such as output it
foreach(DayRankingList drl in rankingLists)
{
Console.WriteLine(String.Format("UserId {0} UserCharm {1} UserName {2}",drl.UserId, drl.UserCharm, drl.UserName));
}

You can use Json.Linq to parse your JSON into JObject and enumerate DayRankingList items (since it's an array). Then convert every item into data class and order the result sequence by UserID
var jObject = JObject.Parse(json);
var rankingList = (jObject["Data"] as JObject)?.Property("DayRankingList");
var list = rankingList.Value
.Select(rank => rank.ToObject<data>())
.OrderBy(item => item?.UserID);
foreach (var user in list)
Console.WriteLine($"{user.UserID} {user.UserName}");
Another way is copy your JSON, go to Edit->Paste Special->Paste JSON as classes menu in Visual Studio and generate a proper class hierarchy (I've got 5 classes, they are quite long to post here), then use them during deserialization

The most type-safe way is to define the class structure that you want, like jason.kaisersmith suggested.
To have the final format you need, though, you might want to do an extra Linq Order and Select, to include the id:
var finalList = rankingLists.OrderBy(rl => rl.UserId).Select((value, index) => new
{
id = index,
value.UserId,
value.UserCharm,
value.UserName
});
foreach (var drl in finalList)
{
Console.WriteLine($"Id = {drl.id}, UserId = {drl.UserId}, UserCharm = {drl.UserCharm}, UserName = {drl.UserName}");
}

New class selected by LINQ query, how to transfer to another model?

I'm really not understanding this as I've only dabbled in MVC and C#. I apologize if my terminology is wrong or confusing, I will do my best to answer questions. I have a couple models like so:
public class DataSharingModels
{
public string ReferenceID { get; set; }
public NBTC NBTCGroup { get; set; }
public Contractors ContractorsGroup { get; set; }
public Coordinators CoordinatorsGroup { get; set; }
public NGO NGOGroup { get; set; }
public Public PublicGroup { get; set; }
public SelectList FA_RA_List { get; set; }
}
public class NBTC
{
public String NBTC_FA_Centroid { get; set; }
public String NBTC_FA_Bound { get; set; }
public String NBTC_RA_Centroid { get; set; }
//more properties...
}
The DataSharingModels class contains the public NBTC NBTCGroup property. It is not public List<NBTC> NBTCGroup because there will only be one produced per instance of the controller being hit.
Now in my controller, I have a LINQ statement that selects a new NBTC class:
var nbtcVals = (from ds in db.SharingPermissions
where ds.FocalRefID.ToString() == ReferenceID
&& ds.ShareGroup == "NBTC"
select new NBTC
{
NBTC_FA_Centroid = ds.CIP_FA_Centroid,
NBTC_FA_Bound = ds.CIP_FA_Boundary,
NBTC_RA_Centroid = ds.CIP_RA_Centroid,
//more properties...
});
Where I'm going wrong is I would like to add that to my DataSharingModels model. I thought the nbtcVals type would be NBTC, but it's IQueryable<##.Models.NBTC>. I understand I could do this, but it seems redundant:
DataSharingModels dsm = new DataSharingModels();
if (nbtcVals.Any())
{
foreach (var i in nbtcVals)
{
dsm.NBTCGroup.NBTC_FA_Centroid = i.NBTC_FA_Centroid;
dsm.NBTCGroup.NBTC_FA_Boundary = i.NBTC_FA_Bound;
dsm.NBTCGroup.NBTC_RA_Centroid = i.NBTC_RA_Centroid;
//more properties...
}
}
What is a more direct way to do this? There must be one. I supposed I could also return an anonymous type in the LINQ query and then assign each property in the foreach like dsm.NBTCGroup.NBTC_RA_Centroid = i.NBTC_RA_Centroid but that seems the same as the other way.

var nbtcgroup = (from ds in db.SharingPermissions
where ds.FocalRefID.ToString() == ReferenceID
&& ds.ShareGroup == "NBTC"
select new NBTC
{
NBTC_FA_Centroid = ds.CIP_FA_Centroid,
NBTC_FA_Bound = ds.CIP_FA_Boundary,
NBTC_RA_Centroid = ds.CIP_RA_Centroid,
//more properties...
})
.OrderByDescending(n => n.Id) // or some other property that could identify sorting
.FirstOrDefault();
This one has a translation to SQL (LIMIT or TOP depending on backend).

Entity Framework 5 - LINQ syntax error

I have the following code where I am creating a IList that I need to filter by the data in another list called List. The locations list represents the locations a user is allowed to view based on their permissions. I am new to LINQ and am confused with error I get (C# Unknown method "Where(?)" of "System.Ling.IQueryable". I have tried various syntax arrangement using either Contains() and Any() or both to no avail. I feel like it's something very basic that I don't understand about doing this. Here is the code:
----- users locations
using System;
using System.ComponentModel.DataAnnotations;
using System.Linq;
namespace Decking.Models
{
public class locations
{
[Key]
public string org_id { get; set; }
}
}
///////// here is the view model
using System.ComponentModel.DataAnnotations;
using System;
namespace Decking.Models
{
public class InventoryViewModel
{
[Key]
public int id { get; set; }
public DateTime metric_dt { get; set; }
public int? item_id { get; set; }
public int? loc_type_id { get; set; }
public string trlr_nbr { get; set; }
public string user_id { get; set; }
public string org_id { get; set; }
public Double numerator { get; set; }
//these are the child entities
[UIHint("ClientItem")]
public ItemViewModel Items
{
get;
set;
}
[UIHint("ClientLocTypes")]
public LocTypesViewModel LocTypes
{
get;
set;
}
[UIHint("ClientOrgsByUser")]
public OrgsByUserViewModel OrgsByUser
{
get;
set;
}
}
}
///////// code to populate the view model
public IList<InventoryViewModel> GetAll(List<locations> locs)
{
IList<InventoryViewModel> result = new List<InventoryViewModel>();
result = entities.inventory.Select(inventory => new
InventoryViewModel
{
id = inventory.id,
metric_dt = inventory.metric_dt,
item_id = inventory.item_id,
loc_type_id = inventory.loc_type_id,
trlr_nbr = inventory.trlr_nbr,
org_id = inventory.org_id,
numerator = inventory.numerator,
user_id = inventory.user_id,
Items = new ItemViewModel()
{
item_id = inventory.items.item_id,
item_desc = inventory.items.item_desc,
},
LocTypes = new LocTypesViewModel()
{
loc_type_id = inventory.loc_types.loc_type_id,
loc_desc = inventory.loc_types.loc_desc,
},
OrgsByUser = new OrgsByUserViewModel()
{
user_id = inventory.user_id,
//mgr_emp_nbr = inventory.mgr,
org_id = inventory.org_id,
},
}).Where(e => e.metric_dt == DateTime.Today && e.org_id
==locs.Any(o=>o.org_id)) // this doesn't work
//}).Where(e => e.metric_dt == DateTime.Today && e.org_id == "SGF") //
this works
.ToList();
return result;
}
Any help you can provide would be greatly appreciated! Thank so much!

The problem is in e.org_id == locs.Any(o=>o.org_id). As I can see in your working example, your org_id is a string.
I guess what you are trying to do is .Where(e => e.metric_dt == DateTime.Today && locs.Any(o=>o.org_id == e.org_id))

MongoDB Unable to determine the serialization information for the expression error

My data is having following structure
public enum ParamType
{
Integer=1,
String=2,
Boolean=3,
Double=4
}
public class Gateway
{
public int _id { get; set; }
public string SerialNumber { get; set; }
public List<Device> Devices { get; set; }
}
public class Device
{
public string DeviceName { get; set; }
public List<Parameter> Parameters { get; set; }
}
public class Parameter
{
public string ParamName { get; set; }
public ParamType ParamType { get; set; }
public string Value { get; set; }
}
I filled 10 document objects of Gateway in a MongoDB database.
Now I want to query all those gateways which contains a device having Parameter with ParamName as "Target Temperature" and whose Value > 15.
I created following queries
var parameterQuery = Query.And(Query<Parameter>.EQ(p => p.ParamName, "Target Temperature"), Query<Parameter>.GT(p => int.Parse(p.Value), 15));
var deviceQuery = Query<Device>.ElemMatch(d => d.Parameters, builder => parameterQuery);
var finalQuery = Query<Gateway>.ElemMatch(g => g.Devices, builder => deviceQuery);
But when I run this, it is giving an exception
Unable to determine the serialization information for the expression: (Parameter p) => Int32.Parse(p.Value)
Please suggest where I am wrong.

As the error suggests, you can't use Int32.Parse inside your query. This lambda expression is used to get out the name of the property and it doesn't understand what Int32.Parse is.
If you are querying a string, you need to use a string value for comparison:
var parameterQuery = Query.And(Query<Parameter>.EQ(p => p.ParamName, "Target Temperature"), Query<Parameter>.GT(p => p.Value, "15"));
However, that's probably not what you want to do since you're using GT. To be treated as a number for this comparison you need the value to actually be an int in mongo, so you would need to change the type of your property:
public class Parameter
{
public string ParamName { get; set; }
public ParamType ParamType { get; set; }
public int Value { get; set; }
}
var parameterQuery = Query.And(Query<Parameter>.EQ(p => p.ParamName, "Target Temperature"), Query<Parameter>.GT(p => p.Value, 15));

Summary
I ran into this when I was modifying a list. It appears that Linq First/FirstOrDefault was not handled well by MongoDB for me. I changed to be an array index var update = Builders<Movie>.Update.Set(movie => movie.Movies[0].MovieName, "Star Wars: A New Hope"); Note: This is in Asp.Net 5 using MongoDB.Driver 2.2.0.
Full Example
public static void TypedUpdateExample() {
var client = new MongoClient("mongodb://localhost:27017");
var database = client.GetDatabase("test");
var collection = database.GetCollection<Movie>("samples");
//Create some sample data
var movies = new Movie {
Name = "TJ",
Movies = new List<MovieData>
{
new MovieData {
MovieName = "Star Wars: The force awakens"
}
}
};
collection.InsertOne(movies);
//create a filter to retreive the sample data
var filter = Builders<Movie>.Filter.Eq("_id", movies.Id);
//var update = Builders<Movie>.Update.Set("name", "A Different Name");
//TODO:LP:TSTUDE:Check for empty movies
var update = Builders<Movie>.Update.Set(movie => movie.Movies[0].MovieName, "Star Wars: A New Hope");
collection.UpdateOne(filter, update);
}
public class Movie {
[BsonId]
public ObjectId Id { get; set; }
public string Name { get; set; }
public List<MovieData> Movies { get; set; }
}
public class MovieData {
[BsonId]
public ObjectId Id { get; set; }
public string MovieName { get; set; }
}

Get child element in another child element of XML

I have a XML file that goes like this... (the XML file was taken from web services [WCF] after passing some value into it.)
<Title>
<Questions>
<QuestionID> 1 </QuestionID>
<QuestionType> Quiz </QuestionType>
<Question> What is the shape? </Question>
<SubQuestionSequence> Part 1 </SubQuestionSequence>
<SubQuestions>
<Keywords> Ring </Keywords>
<ParentQuestionID> 1 </ParentQuestionID>
</SubQuestions>
<SubQuestionSequence> Part2 </SubQuestionSequence>
<SubQuestions>
<Keywords> Round </Keywords>
<ParentQuestionID> 1 </ParentQuestionID>
</SubQuestions>
</Questions>
</Title>
The methods to take child elements as below (written in C#), the commented area is supposed to call the class of subQuestion, but i'm not sure how to write that part :
public class Questions {
public int QuestionID { get; set; }
public string QuestionType { get; set; }
public string Question { get; set; }
public string SubQuestionSequence { get; set; }
//suppose to call subQuestion here
}
public class SubQuestion {
public string Keywords { get ; set ; }
public int ParentQuestionID { get; set; }
}
The actual code behind of the file, also the query area, i does not know how to call if they have another sub section:
void client_GetQuestionCompleted(object sender, GetQuestionCompletedEventArgs e)
{
if (e.Error != null)
return;
string result = e.Result.Nodes[0].ToString();
XDocument doc = XDocument.Parse(result);
var QuestionDetails = from Query in doc.Descendants("QuestionDetail")
select new Questions
{
QuestionID = (int)Query.Element("QuestionID"),
QuestionType = (string)Query.Element("QuestionType"),
Question = (string)Query.Element("Question"),
SubQuestionSequence = (string)Query.Element("SubQuestionSequence")
};
int z = 0;
foreach (var QuestionDetail in QuestionDetails)
{
qID = QuestionDetail.QuestionID;
qType = QuestionDetail.QuestionType;
quest = QuestionDetail.Question;
subQS = QuestionDetail.SubQuestionSequence;
z++;
}
}
As you can see from the top, how can i take the child elements of SubQuestions (The keywords and ParentQuestionID) where SubQuestion itself already is a child element ?
[edit] how can i retrieve the repeated element in the child element ? I want some part to loop and retrieve data, and some doesn't need to loop to retrieve.
int z = 0;
foreach (var QuestionDetail in QuestionDetails)
{
qID = QuestionDetail.QuestionID;
qType = QuestionDetail.QuestionType;
quest = QuestionDetail.Question;
subQS[z] = QuestionDetail.SubQuestionSequence;
//doing it this way, i can only retrieve one row of record only,
//even though i used an array to save.
subKeyword[z] = QuestionDetail.SubQuestion.Keywords;
z++;
}

As long as there is only a single SubQuestions element you can simply access Query.Element("SubQuestions").Element("Keywords") respectively Query.Element("SubQuestions").Element("ParentQuestionID").
[edit]
As for you class with an object of the type SubQuestion you would simply use
public class Questions {
public int QuestionID { get; set; }
public string QuestionType { get; set; }
public string Question { get; set; }
public string SubQuestionSequence { get; set; }
public SubQuestion SubQuestion{ get; set; }
}
public class SubQuestion {
public string Keywords { get ; set ; }
public int ParentQuestionID { get; set; }
}
and then in your query you can use e.g.
var QuestionDetails = from Query in doc.Descendants("QuestionDetail")
select new Questions
{
QuestionID = (int)Query.Element("QuestionID"),
QuestionType = (string)Query.Element("QuestionType"),
Question = (string)Query.Element("Question"),
SubQuestionSequence = (string)Query.Element("SubQuestionSequence"),
SubQuestion = new SubQuestion() {
Keywords = (string)Query.Element("SubQuestions").Element("Keywords"),
ParentQuestionID = (int)Query.Element("SubQuestions").Element("ParentQuestionID")
}
};

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